I only used Mobil 1 because it was $25/case at Costco and it was supposed to be a good oil, and at one time I believe it was. Now it is all marketing and riding their own coat tails.
Mobil 1 bashing has never gone out of style, but truth be told, it's not bad oil. I'm guilty of making some less than savory statements about them as well, just to turn around and give them another chance. Not everything they make is "gold", and their gear oils and transmission fluids don't have exactly a stellar reputation. Not exactly all transmission fluids, just some of them. And then they had that goof-up with the Mobil 1 ATF LV HP, which they had to reformulate for GM. But their motor oil is solid.
And just like you find people that have something bad to say about Mobil 1, you'll find those who don't like Pennzoil or Castrol. And for the most part their reasons are non-scientific and just personal preference, opinion, or they experienced some oil consumption with one of these brands in their engines. And the funny thing is that the oil consumption might not even be related to the oil.
You also have to realize that the 0W-16, 0W-20, 5W-20, 0W-30, and 5W-30, all of these viscosities are now highly regulated. API SP places many restrictions on them, while at the same time asking a lot from them. I try to avoid these oils as much as possible, and only use them when there is a good reason for it, like in the Sonata. This particular vehicle has START/STOP, and other people in my family drive it. Still, we live in a hot climate. A 5W-30 ILSAC oil is therefore very appropriate for this engine. It gets up to operating temperature, and even if the engine is off for a while at a stop light or sitting in traffic, the oil is not too thick for when the engine starts back up.
But old tech engines like the 3.3 Lamba II discussed here? Well, they were never designed for thin oils in the first place.